Acta Phys. -Chim. Sin. ›› 2016, Vol. 32 ›› Issue (9): 2264-2270.doi: 10.3866/PKU.WHXB201606141

• ARTICLE • Previous Articles     Next Articles

Adsorption of Radioiodine on Cu2O Surfaces: a First-Principles Density Functional Study

Kui LI1,Yao-Lin ZHAO1,*(),Jia DENG1,Chao-Hui HE1,Shu-Jiang DING2,Wei-Qun SHI3   

  1. 1 School of Nuclear Science and Technology, Xi'an Jiaotong University, Xi'an 710049, P. R. China
    2 Department of Applied Chemistry, School of Science, Xi'an Jiaotong University, Xi'an 710049, P. R. China
    3 Key Laboratory of Nuclear Radiation and Nuclear Energy Technology and Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, P. R. China
  • Received:2016-04-11 Published:2016-09-08
  • Contact: Yao-Lin ZHAO E-mail:zhaoyaolin@mail.xjtu.edu.cn
  • Supported by:
    National Natural Science Foundation of China(11275147);Program for Changjiang Scholars and Innovative Research Team in University, China(IRT1280)

Abstract:

The adsorption behavior of radioiodine (I2) molecules on three different low-index surfaces of cuprous oxide (Cu2O) was systematically investigated using first-principles density functional calculations with periodic slab models. The role of typical surface adsorption sites was evaluated by calculating structural parameters of the adsorption configurations and energy features. Moderate geometry relaxation of the three low-index surfaces was observed. The results of geometry optimization and total energy calculations indicated that the Cu2O(100) and (111) surfaces exhibit higher reactivity towards I2 adsorption than the Cu2O(110) surface. The surface oxygen site (OS) was determined to be the most favorable adsorption site on the Cu2O(100) surface, while the coordinatively unsaturated copper site (CuCUS) was energetically preferred on the Cu2O(111) surface. In addition, the electronic structure information for several typical configurations were explored to explain the detailed interaction mechanism of adsorbed systems.

Key words: Radioiodine molecule, Cu2O, Surface adsorption, Low-index surface, Density functional theory calculation

MSC2000: 

  • O641